Henry l



(No Model.)

, H. L. MOR-RELL. v SPIRAL FILE FOR SAW FILING MACHINES.

No. 598,268. Patented Feb. 1, 1898.

1 9110 v 81400144106 QfXZZ k k! abtomzg 2Z6 '4 UNITED STATES PATENTFFICE- HENRY L. MORRELL, OF BROOKLYN, NEW YORK.

SPIRAL FILE FOR SAW-FILING MACHINES.

SPEGIFIGATION forming part of Letters Patent No. 598,268, dated February1, 1898.

Application filed April 3, 1897. fierialllo. 630,560- (No model.) I

and setting saws such as that heretofore in vented by me and patented inUnited States Letters Patent dated November 3, 1896, and numbered570,732, by reference to which the location of the spiral files in themachine and the parts and their coactive relationship will at onceappear.

Generally stated, the invention consists in a strip or piece of steel ofthe proper shape and length coiled upon itself spirally, the innerportion of which is preferably flattened and has right angles at itscorners, and the outer portion of which is given the contour or shape ofthe teeth to be filed, and upon the outer portions are cut thefile-teeth at such an inclination (right and left) as to effect theproper filing of the saw, since the files in the machine are used inpairs, one turning to the right and the other to the left, so as toproperly file the teeth, which have the right and left inclination,respectively, and these spiral files are adapted to screw into spiralgrooves upon the exterior surface of metallic sleeves, so that the fileswill be firmly held in them, and they are attached to the sleeve attheir forward end only, Therear end being left free adjusts itselfas'circumstauces may require. The forward end of the spiral fileadjacent to the place where it is attached is preferably tapered towardthe end in all directions, so that it will enter the teeth of the saw tobe filed in a gradual, smooth, sliding manner, and the full bearing ofthe file upon the teeth will not take place until, say, onesixth orone-fifth has passed by the teeth.

Among the special advantages secured by me arethe security with whichthe files are held upon the sleeves, the ease with which they may beengaged with the sleeves, the fact that expansion and contraction eitherof the sleeve or of the files has no effect upon the latter, becausethey are attached at one place only, and the fact that the rear end ofthe file has independent movement, so that it can adapt itself toexactly the pressures exerted upon it, and also the fact that movementlongitudinally of the sleve is precluded because of the groove in whichthe files are supported, which is made to exactly coincide with theshape and size of the files themselves.

Referring to the drawings, Figure 1 illus trates an edgewise elevationof a pair of files made under my invention, they being right and left,respectively, as shown. Fig. 2 illustrates a vertical sectional view ofthat which is shown in Fig. 1. Fig. 3 illustrates a perspective of oneof the spiral files detached from its sleeve.

A A are the metallic ring like sleeves. They are cylindrical in shape,as shown, and are adapted tomfit the rotary blocks in the machine, inconj auction with which they are used. (See my former patent.)

B B are spiral grooves cut in the exterior of the sleeves, having strongspiral ribs 0 O at each side, which firmly hold the filesin place.

D D are the files themselves. As shown in Fig. 3, they are somewhatextended strips of metal which are flattened upon their surfaces whichengage with the grooves Bin the sleeves, and their exterior surfaces, asseen. best in Fig. 1, are inclined at both sides, so as to form aoircumferentially-running edge, the contour of this part of the filesbeing that of the teeth which are to be filed. This machine being usedby me principally for sharpening butchers saws, there is a single formof tooth only required, since the teeth of all butchers saws, orsubstantially all, have one and the same shape or contour. Upon theseinclined edges file-teeth are cut, as shown at E E.

Near the forward end of the files a hole F is bored, through which a pinpasses which fastens this front end to thesleeve, and at that end, asshown at G, Fig. 3, the file is sharpened by grinding off a portion ofits end, and likewise it is not made quite so thick radially as at itsother portions, so that it slides gradually into the tooth to be cut.The distance through which the reduced thickness extends is only an inchand a half, (depending upon the size of the file,) and from that onthroughout the rest of the convolution or convolutions the file is of auniform thickness.

The files and sleeves are of course made separately, and the files afterhaving been duly out are tempered in the desired shape. They are thenthreaded upon the sleeves by screwing them along and into the spiralgrooves in the exterior surface of the sleeves until the hole F engageswith the corresponding hole in the sleeve, whereupon a rivet or a smallscrew is employed to fasten the parts together. The file is not fastenedto the sleeve at any other place, excepting so as to prevent it frommovement by the lateral ribs O O on the sleeves, so that it may expandand contract and may move toward and from the sleeve as necessityrequires. In this way all distortion of the parts and jamming of thefile,

It will be obvious to those who are familiar with such matters that thefiles may be made of any desired length, so that instead of making asingle spiral convolution with suitable overlapping of the ends, asshown, they may be sharper and longer.

I claim- 1. A filing device for saw-filing machines, consisting in ametallic sleeve having a spiral groove cut in its exterior surface, anda continuous, spiral file adapted to rest in said groove, the partswhereof which engage with it being of substantially the same shape, andthe exterior surface of the file being shaped to conform to the teeth tobe filed, for the purposes set forth.

2. A saw-filin g device embodying ametallic sleeve havinga spiral grooveformed in its exterior surface, and a continuous, spiral file threadedin the said groove and fastened therein at one point only, for thepurposes set forth.

Signed at New York, in the county of New York and State of New York,this 26th day of March, A. D. 1897.

HENRY L. MORRELL.

Witnesses:

PHILLIPS ABBOTT, A. B. MORRISON.

